linux-kernel - [PATCH 13/18] Hibernate: Avoid S4 sign key data included in snapshot image

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Date:	Thu, 22 Aug 2013 19:01:52 +0800
From:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-crypto@...r.kernel.org,
	opensuse-kernel@...nsuse.org, David Howells <dhowells@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Josh Boyer <jwboyer@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Matt Fleming <matt.fleming@...el.com>,
	James Bottomley <james.bottomley@...senpartnership.com>,
	Greg KH <gregkh@...uxfoundation.org>, JKosina@...e.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Gary Lin <GLin@...e.com>, Vivek Goyal <vgoyal@...hat.com>,
	"Lee, Chun-Yi" <jlee@...e.com>
Subject: [PATCH 13/18] Hibernate: Avoid S4 sign key data included in snapshot image

This patch add swsusp_page_is_sign_key() method to hibernate_key.c and
check the page is S4 sign key data when collect saveable page in
snapshot.c to avoid sign key data included in snapshot image.

Reviewed-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Lee, Chun-Yi <jlee@...e.com>
---
 kernel/power/snapshot.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 72e2911..9e4c94b 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -860,6 +860,9 @@ static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn)
 
 	BUG_ON(!PageHighMem(page));
 
+	if (swsusp_page_is_sign_key(page))
+		return NULL;
+
 	if (swsusp_page_is_forbidden(page) ||  swsusp_page_is_free(page) ||
 	    PageReserved(page))
 		return NULL;
@@ -922,6 +925,9 @@ static struct page *saveable_page(struct zone *zone, unsigned long pfn)
 
 	BUG_ON(PageHighMem(page));
 
+	if (swsusp_page_is_sign_key(page))
+		return NULL;
+
 	if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page))
 		return NULL;
 
-- 
1.6.4.2

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